Neurologist

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Drug Information Update: FDA Drug Safety Communication: Risk of Progressive Multifocal Leukoencephalopathy (PML) for the use of Tysabri

FDA/CDER/Division of Drug Information (DDI)

The Division of Drug Information (DDI) is CDER’s focal point for public inquiries. We serve the public by providing information on human drug products and drug product regulation byFDA.


The U.S. Food and Drug Administration (FDA) is alerting the public that the risk of developing progressive multifocal leukoencephalopathy (PML), a rare but serious brain infection associated with the use of Tysabri (natalizumab), increases with the number of Tysabri infusions received.This new safety information, based on reports of 31 confirmed cases of PML received by the FDA as of January 21, 2010, will now be included in the Tysabri drug label and patient Medication Guide (see Data Summary for additional information).

Tysabri was approved by the FDA in November 2004 for the treatment of relapsing forms of multiple sclerosis (MS). Tysabri is also approved by FDA for treating moderately to severely active Crohn’s disease.

For more information please visit: Tysabri

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February 5, 2010 - Posted by | 1

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